<!DOCTYPE html>
<iframe srcdoc="
  <!DOCTYPE html>
  <style>body { margin: 0; }</style>
  <svg xmlns='http://www.w3.org/2000/svg'>
    <linearGradient id='gradient'>
      <stop stop-color='green'/>
    </linearGradient>
    <rect width='100' height='100' fill='url(#gradient) red'/>
  </svg>"
  style="margin: 0; border: none" scrolling="no">
</iframe>
